<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        #div1 {
            width: 100px;
            height: 100px;
            background: red;
            position: absolute;
        }
    </style>
    <script src="bundle.js"></script>
</head>
<body>
<div id="div1"></div>
</body>
</html>